Ok assuming I followed you correctly... I had a PSU around instead of the battery, regardless I can extract 12V from there, so that replaced the battery.
Negative cable to W3, exiting BK/G, going to LEDs (with positive plugged normally), LEDs powered on.
Negative cable to BK/G, exiting W3, going to LEDs (with positive plugged normally), LEDs powered on.
Positive cable to W3, exiting BK/G, going to LEDs (with negative plugged normally), LEDs powered on.
Positive cable to BK/G, exiting W3, going to LEDs (with negative plugged normally), LEDs powered on.
So I guess... Blown 100%, unless I've misunderstood what you were asking me to do.
Then the real question is... Why did it not work with the other regulator though? Can they be incompatible somehow with the stator and its coils?
And why were my tests flipped? I've done everything according to manuals
Maybe that mighty Kawasaki tool has reversed polarity? Because for once I am 100% positive I did not screw that up, instructions are clear and easy.
I would *guess* that the reason it worked for a bit is that it was like almost shorted, and it was sort of "hanging on", but then it gave way to full contact and failed entirely. That would explain at least one thing out of this mess...